Editing Permissions in the Settings File or Database

[Itchdog]

So. My host sucks (Host Gator). When trying to edit permissions in the software (admin>tinyportal), my host security keeps blocking it with mod_security, and won't allow the settings to save. Here is the error I get:

Not Acceptable!

An appropriate representation of the requested resource could not be found on this server. This error was generated by Mod_Security.

It's not the software. It's the host. I've been on chats with them multiple times and they can't resolve it. They even whitelisted the entire domain but it keeps happening. The only way I can get around it is to manually edit the files themselves on the server with File Manager. This is not for EVERYTHING, but occasionally a setting will trigger the host security when I try to save. It's annoying and as soon as I have the time and resources, I intend to move my sites to a new host.

But for now, I need to edit some settings. At the moment, I'm trying to edit the article settings so a custom membergroup I created has permission to view articles. Here is the path to the setting in question:

► TP admin
► Categories
► Edit

I'm trying to add "Ambassador" to the "Membergroups that can see this category". Can anyone tell me what file or database table to edit to manually add this permission?