Derek, when you ask a question, there is a place at the bottom of the entry box where you can enter the WikiTree ID of a profile the question is about. Just below that is a box for tags. You enter sort of key words - it's not very well documented which tags are followed by specific projects, but you can also enter a surname and any member who is following that surname will be alerted to your question.
If you edit your question, you enter tags separated by a space. If one tag is 2 words, then you use an underscore instead of a space between the words so that it gets interpreted as a single tag. For example, Lynda entered a tag on your question - you'll see profile_changes on your question here. When you edit the question, just find where that is and add a space after it, followed by bugs, then another space, and finally sysops. You can enter up to 6 different tags on a question, by the way.
EDITED TO ADD: I just saw that Lynda changed the tags again and added bugs to profile_changes.