GroupJive Users Tab by Default

My Client wants to know if the "users" tab can be set to be the default tab showing when entering a group page.

Also is there a way to change the name of the tab from "Users" to something else, like "Members".

My Client wants to know if the "users" tab can be set to be the default tab showing when entering a group page.

Nope, at this time you can't rearrange the core tabs. You can only rearrange the plugin tabs by reordering the plugins in plugin management.

Also is there a way to change the name of the tab from "Users" to something else, like "Members".

Yes, navigate to GJ > Config > General > Overrides and you can quickly override its usage all throughout GJ.