I've added this to my meme post https://pseudonym-loving-magpie.dreamwidth.org/748.html and I'll see if I can also put the source code here in an outer text area:
<img src="https://i.imgflip.com/2ojavo.jpg" alt='Meme image' /> [Distracted boyfriend meme] Boyfriend: Me with a new social network account Girlfriend: Posting a variety of topics Other woman: Posting about social networks 24/7 #i need more memes here #fake hashtags <hr> Reblog/response starter text: <textarea> <user name="pseudonym-loving-magpie"> <a href="https://pseudonym-loving-magpie.dreamwidth.org/748.html">posted</a> <img src="https://i.imgflip.com/2ojavo.jpg" alt='Meme image' /> [Distracted boyfriend meme] Boyfriend: Me with a new social network account Girlfriend: Posting a variety of topics Other woman: Posting about social networks 24/7 <hr> <user name=""> Put your username in the quotes, and replace this text with your response. Or delete the username tag if you don't add a response.


That almost worked, but you can't see the end tag for the text area at the end. Anyway there should be a textarea end tag at the end.

I made some changes though, so that the reblog could include the whole post (except hash tags) and a response.