Cannot OP myself in my Realms Server

I am the owner of a Minecraft Realms server. I am trying to use command blocks but must first OP myself so I can edit the commands. When I type "/op <my name>", red text saying "You do not have permission to use this command" comes up.

I can op other people on my server through the realms menu, but not myself.

Normally, in any other server I can OP myself through the server's folder, in the ops.txt document. In Realms, I have no idea how to go about this because I don't host the server. I'm just the admin.