How can I select a category for an uncategorized already created Topic?

I have created a new topic, which is in fact an Activation report, but I didn’t realise that this categorization feature was available at the moment of creating the topic. So it is currently Uncategorized.
Now I have editted the post and tried to find a way to give the “Activation report” category to it but I can’t.
Can someone help, please?
Thanks and best 72/73 de Guru - EA2IF

When you edit your topic (click the pencil) you can change the category.

73, Hans PB2T

Dear Hans,
I tried so last night but it didn’t work, That’s why I asked the question.
But this morning tried it again after reading your reply ans it has worked fine.
Thanks and best 73 de Guru - EA2IF