Hello @barbie3565 ,I saw your question "how to tag". I would like to try to help.
To tag someone place the symbol "@" in front of the name of who you want to tag. Note: Do not leave a space!
At this time, work is being done on the community site which sometime prevents a active tag. After doing the (above steps) I hit the backspace key once or twice until the auto fill feature kicks in and I tap or click on the appropriate name. We are asked to please be patient to while this work is going on.