Can someone help me, I just posted an image but I can't tag the artist. I also added the artist (moonliefet) but when I search for it, it doesn't appear.

According to the post change history you removed the artist tag yourself, then Kemonophonic came and added it back (after you made this post)

Visual guides on how to make new artist / character tags:

• Method 1: https://imgur.com/a/rXe2zcp
• Method 2, assumes the tag already exists: https://imgur.com/a/47T22Et
• Method 3, assumes the tag does NOT exists: https://imgur.com/a/VLrOgK3

Courtesy of tsukemono

faucet said:
According to the post change history you removed the artist tag yourself, then Kemonophonic came and added it back (after you made this post)

yes I removed it because I thought I was in the wrong place, thank you very much I'm sorry this is the first time I post here.

gattonero2001 said:
Visual guides on how to make new artist / character tags:

• Method 1: https://imgur.com/a/rXe2zcp
• Method 2, assumes the tag already exists: https://imgur.com/a/47T22Et
• Method 3, assumes the tag does NOT exists: https://imgur.com/a/VLrOgK3

Courtesy of tsukemono

Thank you, this will help me a lot for my next posts.

New tags are general by default, they only go straight to another category if somebody else set the tag's type.