Inserting something: Writing Correction

Okay, I’m trying to do a writing correction and there are often times when I want to insert a word or punctuation.
I’ll make up an example.
“I like to read, watch TV”
Now, if I want to add an “and” in there, it seems I would have to select the comma too. But I’d like to just insert the word.

Do you see what I mean? How can I accomplish this type of thing?

Yeah I was wondering if there was a way to do it without affecting the comma.

But that’s fine I suppose.