Hi WriteSeed,
I've sent 3 times from last 5 days, but no response. So now I'm trying to ask questions here. I already bought Tier 6.

1. I want to rewrite my existing content, how can I do so?
2. Is there a way to use an existing URL of a website or video to write content?
3. How can I give my own prompt with particular headings/outline to write content?
4. For generating images:
4.a. Currently it only shows 3 resolutions, how can I get different width images? 
4.b. How can I upload my own image and edit images?