Curious, how do I edit my posts?

[alsmom360]

But, u only have ten minutes from moment of first posting the words, to edit same.

I"m so glad there was a thread on this.  I was going to ask same question but I searched and someone else did.  I apologize because I think two of my threads doubled because I tried to edit without knowing how and it made the same post again w/o the edit I added.  Now that I have this info I can do it right w/o looking totally computer challenged.