riddle - See Me Once, See Me Twice #6 - Fanmade

This is another see me once, see me twice riddle that has been done by @Cashbee. Here is a link to the last one done by them.

See me once, I am a change,
See me twice, changes have already been made.
See me once, I am 4,
See me twice, I am 6 and 2.
See me once, I could be done here.
See me twice, people have done this here.

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Hopefully this isn't too tricky. Thought of it on the way home last night and thought it could be interesting. Good Luck!

Answer

I think the answer might be

Edit

See me once, I am a change,

An edit is a change

See me twice, changes have already been made.

Editedit = Edited it

See me once, I am 4,

Edit is four letters long.

See me twice, I am 6 and 2.

Edited it is six and then two letters.

See me once, I could be done here.

I am writing this in an edit,

See me twice, people have done this here.

People edit questions and answers here all the time.