I can see how those Tasker screenshots might be a bit confusing for those who haven't used Tasker a lot. Here's a step-by-step for installing waspi's rules:
Starting on the Tasker homescreen, with the PROFILES tab selected:
- Press "+" in lower right corner
- Select "State"
- Select "Sensor" > "Orientation" (or type "orie..." into filter field)
- Select "Is" > "Left Side"
- Press back arrow in upper left
- Press "+" next to "New Task"
- Enter name "SetOrientationPortraitReverse"
- Press "+" in lower right corner
- Select "Display" > "Force Rotation" (or type into filter field)
- Select "Mode" > "Portrait Reverse"
- Select "Alternative Method (Check Help)"
- Press back arrow in upper left
- Return to PROFILES tab
Now just repeat all these steps (with the obvious changes of course) for "Orientation Right Side" > "SetOrientationPortrait", and for "Not Orientation Left Side" + "Not Orientation Right Side" > "SetOrientationLandscape". The last one is a little trickier, because first you have to select "Invert" when you create the profile (to get the "Not") and then
after you have created the SetOrientationLandscape task, press and hold on "Not Orientation Left Side" (on the same line on the screen where it now says "SetOrientationLandscape",
not the title line above that, and select "Add" to add the second second state, "Not Orientation Right Side" (again remember to select "Invert" here).
Tasker is a bit daunting when you first start to use it. It kind of has to be, because it's incredibly powerful. Given its broad range of abilities, the UI actually is very well designed, and once you get used to it, you'll find it quite easy to get it do the things you need. It's just a bit scary at first. When I write out all these steps, it sounds a lot more complex than it really is. It's really pretty intuitive once you get the hang of it.
Hope this helps!