…especially if you’re new to Tumblr.
While reblogging a text post, especially a longer one, make sure that it stays in the text form, not the link form (the abridged one with the ugly green bar at the top).
To change the type of post, choose appropriate icon in the upper right corner of the post-making window (the one next to the cog icon).
Please reblog posts as links only when you intend them to be abridged.