AV-8B Delete Waypoint, Slew waypoint, and Waypoint offset

[GDICommand]

I know you can edit a way point via entering coordinates Lat/Long after selecting a waypoint, but how do you:
- delete a way point? In single player I'd like to clean up junk in the form of a dozen waypoints I no longer need/want, and in multiplayer mostly the same, but also some servers add waypoints I've noticed, which I don't want anything to do with
- slew a waypoint via the TDC? I've seen this guy do it here: https://youtu.be/lvfwk_Xq1do but he kind of glosses over what buttons to push because he seems to be using his keyboard instead of the cockpit itself.
- Set a new waypoint from an offset of a previous waypoint? Same video as previous bullet point, the same guy does this, but when I try to do it in a practice mission in single player, I can't seem to get the waypoint to set correctly

[ZeroReady]

That's the same video I learned how to do offset waypoints, works fine for me. What is the exact problem you're having?

[GDICommand]

Well I have no idea how to delete a waypoint. Unless I misheard him doing it, I don't think that guy does any deleting waypoints at all in that video.

Slewing waypoints, I discovered the 'sensor select' switches after hours of frustration trying to move around the DMT/TPOD and such. So, I'll have to revisit moving waypoints and see if that fixes my issues with that.

As far as setting an offset, that I went to go enter, which seemed to enter fine, but the waypoint never ended up existing when I was done. I remember the bearing being entered and taking correctly, but when I tried to enter the range, nothing seemed to happen. It kept the range at 0.