Drupal 7.x

Hi, I have searched and googled and not found anyone with the same issue so here goes: -
I have a site I am developing and am nearly finished. I wanted to upload some new banner pics from the stock Marinelli ones and successfully deleted the 6 stock pictures. When trying to upload a new picture I get the following: -

I have just installed Drupal on my web host account, and my IP keeps getting blocked by the firewall of my webhost.

They told me that

Your IP "116.15.70.24 " has been blocked in the server firewall due to the following reason:

===============
Mar 16 00:17:22 sg15 lfd[16786]: 5 (mod_security) rule triggers from 116.15.70.24 (SG/Singapore/bb116-15-70-24.singnet.com.sg) in the last 300 secs - *Blocked in csf* [LF_MODSEC]
===============

This seems like a very basic thing, but I can't figure out the right way to do it...

Basically, I want to enter an HTML "A" tag into the body of a node, creating a link to some other node in my own Drupal website, and I want that link remain valid even if I reorganize my website in a number of ways... The destination node isn't moving around... so any link to it really should remain valid.

Some examples of the issues that arise are...

This seems to me like a very basic feature for creating a maintainable website, but I can't figure out any way to do it without writing my own module code.

Basically, I want to have a central list of "canned" text resources. Then, I want to insert references to those resource items into the middle of nodes, and have the text show only when the node is rendered (ie: not during edit).
So, later I can update the canned text resource, and every node page referring to that particular resource will be updated.
This central list could just be regular nodes which would work very well: They could have very little content (just a couple of words), or they could have alot of content, inserting whole paragraphs (such as a legal disclaimer that goes at the end of certain pages).

Specifically, I want to have one location to store the current version of each application that can be downloaded... but I want to show that current version on each description page that talks about the application. The central location will be updated programmatically when the application is updated, and all the description pages would then automatically be up-to-date.

I thought that "Tokens" might do it, but they seem to be only for templates... not for entering into the node content. Is there something I'm overlooking?

Just wanted to share a small site I just handed over to the user ... he will be maintaining the content...
The site is done with Drupal 8 with a very small installation using ZEN theme, Colorbox for galleries.

I will add a guestbook too but have not found in for Drupal 8 yet.
The boy wanted the head as big as it is - I hope I get the chance to make it smaller later on when he is more use to it as I think it is a but too big for the site, but I hope you have a big screen :-9

Loading Gigya socialize module in drupal 7. I got it uploaded safely but it's telling me that the module requires a token. Don't know what is meant by this (TOKEN). I also found a different version of the Gigya module, but I am unable to uninstall the current module. I am extremely new to website development, so much of this is quite a challenge, but I'm a very fast learner & very persistent!

I can be reached by email @ tarpleyt@gmail.com