Is it possible to delete / uncheck the “Flag” option ?

Yes you can. Simply follow instructions written here: Remove flag link from anspress question and answer

I backed up,I deleted anspress,I restored,questions were not

Translation error. questions were not coming back

I backed up,I deleted anspress,I restored,questions were not

You say “questions were not” and then you say “questions were coming back”. So the Questions are or aren’t ? And “are or aren’t” WHAT ?

Commenting don’t work

Commenting in the latest official stable version is working well. Maybe you have some conflict. Switch to the default theme of WP and then disable some plugins until you find the cause of conflict. Standard WP debug protocol to follow.