You can reply to a post on Tumblr using the small speech bubble at the bottom of the post. Not all posts allow you to reply.
you cant
You can only comment on a post of someone's tumblr if they allow replies to their posts. You can see this option under Customize-> Community -> Replies.
24-48 person
I tested this myself and yes, they can reply to you immediately.
Unless you are following this person, in which case it will appear on your newsfeed, then you must go to their tumblr and look on their profile to see if your question is there. If they have replied to your message, it WILL be posted on their profile. If they did not reply, your message will not show up.
a couple on tumblr.
he doesn't have a tumblr.
If you go to Tumblr's home page, it has a form for you to fill out to make an account with Tumblr.
Zayn does not have a Tumblr.
Yes! There is no age limit for tumblr.
Bradfordbadboi|tumblr
she does nothave a tumblr