Good luck with the (possible) pump. Your sig says Type 1 and your original post says you changed your diabetes type. What did you change from? And about the "alerts" where do you get alerted and about what, a reply?
Misdiagnoses are surprisingly common, particularly when adults develop diabetes. Many adults are assumed to be Type 2 simply because they're adults, but are later found to be Type 1.
The alerts should appear on the top right of your screen by the flag to the right of the Message envelope. Every time someone tags you, you should receive an alert. You should also get an alert if someone quotes your post like I have now.
A tag is simply to draw a person's attention to a post eg if you have rare condition XYZ and a new member is asking about that, another member may tag you in their reply so that you are alerted to the thread and can contribute.