Even a link will do.
In a forum topic like this one, you can click on any ones username, which will show a popup, which can be clicked on to view that users profile, once there there should a button saying activity, if you can’t find it, here it is:
if you can’t find a post of yourself, you also have a profile picture in the top right corner, which opens your notifications menu, which also contains your user name, which if clicked on, takes you to your profile page
it didn’t capture the cursor, its in the top left of the notification menu (Where my username is, which i can click on, taking me to my profile). From there i can click on activity, to view my activity