Tumblr redirect page not working?

[Raymi]

I made a tumblr for a project i'm working on, and need to sort the information into certain categories. I went to make a redirect page so I could tag posts (example "Gardens") and they would show up in that page, but the only thing tumblr is giving me is standard and custom. I tried using different themes but it's not working, and I thought maybe it's because the tumblr was made and hour ago? I confirmed the e-mail address and everything. Super clear instructions would help, or other suggestions! thanks in advance!