teach me how to add tag to an existing post

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teach me how to add a tag to an existing game thread

i have a game thread & can't figure out how to add a tag to it now that its been published

please help
thanks

 

[Tripod70]

Oh that's easy but I bet you finger it out...

 

[highlrecommend]

thx to @Tripod70

 

[Tripod70]

I fixed that last post