I was just wondering if there was manual for Group Jive?

Just the installation guide included with GJ.

With regards to CB, is there a way for users to cancel their membership from the frontend rather than having to delete them from the backend?

We don't provide anything to do this, but there's a plugin called CB Delete Me that does this. There maybe others available as well. It can also be done with CB Auto Actions in a Code action and a checkbox field; you'd check that the checkbox was checked then use CB API in a Code action with PHP to delete the user.

Maybe there is a function to hide the profile rather than delete them when the wish to close their account?

Don't know if there is a plugin for this, but you could do the same as described above and instead of delete them set their block status to 1 to block their account.

I notice when I do delete a user from the backend, it also deletes all the groups they created. I would really like to keep all groups created for future user discussions.

There's no feature to disable this. If you intend on deleting users often then do not allow them to own groups or change the ownership before you delete them. A Category or Group can not function properly without its owner. You can delete this code within plugin.cbgroupjive.php if you still don't want content removed when user is deleted from CB.

Also, when a user in Group Jive is on a Group Page they created, they have the option to delete their group. Is there a tab option to remove this "Delete Group" button so that this group remains for future users, rather than having to go into code to remove the button?

Nope, you'd need to edit the code to remove the delete link. A owner has the right to delete his own group. I suggest you just not allow users to own groups if you don't want them to have such permissions.

One last thing, when users type in the description in Group Jive for a category or group, is there a function under configuration to prevent the user from typing over a certain amount of characters. e.g. 250 character description.

Yes, GJ > Config > Categories > Description > Input Limit and GJ > Config > Groups > Description > Input Limit.

Yes the path is correct. Config and Configuration are the same, it's just shorthand. Please ensure you're using GJ 2.7 though as it wasn't introduced until then.

Both of those are Joomla extensions. Ensure you're installing through Joomlas extension installer. They are not important to GJs functionality. They provide a GJ module and GJ search plugin for searching Groups with Joomla search.

How often do updates usually occur on Group Jive?

Not as often as incubator projects, but often as needed.

Are all CB updates usually broadcast by email?

Most of them are, yes.