How to solve "if the values are set for the second glyph..."

[Faridkim11]

Hey there, i wanna ask. How to solve this issues

https://www.facebook.com/photo.php?fbid ... 063&type=3
Excuse me gentlemen. sorry to ask. Why is this red mark? The one with the words If Values blah blah blah..

This problem arises when I try to idly untick the "Disabled unused settings" checklist then I try to move the second letter. after that, I want to set the second kerning but it doesn't work anymore. please enlighten me

Another issues here:
https://m.facebook.com/groups/belfont/p ... 5253304649
This problem also appears here. even though it's the same as finding "ed" but the kerning can be different.

[Bhikkhu Pesala]

See this topic in help

Why do you want to adjust the value for the second glyph in the pair?

[Faridkim11]

I want to create "Ti" word properly instead of adding ligature one with changing "i" glyph XY-placement.
But I didn’t know it will affect to another second glyph.

So I decide to get back one, but still don't know how to get it back.

When I make all second glyph values (XY Advance and placement) with zero, the alert doesn't disappear.