Guild Wars 2

When someone sends you a guild invite, where does it show up to let you know? I’m having game client/tech support issues and want to know if it is because of that or if I’m just an idiot and don’t realize that the invite is there for me to join up.
Im new to PC gaming and MMO’s especially and want to join up with some people to quest and loot. Tech Support wants me to do a laundry list of things and I just want to make sure Im not missing something obvious before I waste a day dealing with them.
Any help would be appreciated big-time.

I’m also new but I receive a popup in the top left corner that shows me that I have been invited to join a guild.

Check your guild tab, it will be at the bottom left I believe as well as that initial popup.

Thanks, Im not getting that so I get to deal with tech support. Yeah