Please follow the steps below to create an artist:
Click 'Add new artist profile':
Fill in the information:
Then click 'Create profile'.
Useful articles:
Where to find Spotify ID - https://support.tunearo.com/hc/en-gb/articles/4810498677023-Where-can-I-find-my-Spotify-ID
Where to find Apple Music ID - https://support.tunearo.com/hc/en-gb/articles/4810478000671-Where-can-I-find-my-Apple-Music-ID