Solved subject by someone

Hello,

How to generate a "solved by … in post … " after a positive dialog !?
Solution flag ?

Choose the reply which is the solution and click the three grey dots in the bottom right of that reply (next to the “Reply” button). Click the grey dots, and you’ll see a “Solution” button appear. Click that.

I suggested this before but Solution wasn’t found by @jpc - they said the option wasn’t available. What changed?

Is my account correct ?
shall I change a parameter ?

WHY THE SOLUTION FLAG IS VISIBLE IN HIS THREAD ?!

Please check why I cannot see the solution flag !