@vishae Start a new line with a right angle bracket (>), followed by space, followed by the text you want to quote.

Micro.blog uses an unspecified superset of John Gruber’s original Markdown spec. There’s a quick reference article for basics in Help, and more examples on Daring Fireball. (The superset includes other things, too, like tables, which mainly serve to inadvertently break things any time someone uses a vertical bar!)