How to bind pet abilities?

Help please. Idk how to bind my pets abilities.
Not sure what you're trying to do. Try explaining in a little more detail and I think you'll find a lot of help here.
So many questions.

If you are trying to access all of your pet's abilities in a battle you cannot. You only have access to three abilities in a battle.

If you are trying to change a pets abilities you can do that in the pet journal. Just drag the pet into one of the three slots and click on the abilities you want. Depending on the pet level abilities will be locked.

If you are talking about Hunter's pets this is the wrong forum. You want to go to the Hunter's forums but there people who play Hunters here so you may still get some help.
I think she is talking about the action bar hotkeys during a pet battly (1234)

Dunno if they can be changed or not
I want to say the action bar hotkeys default to whatever your main set is. Mine are QWE because of my set up.
I use an addon called Battle Pet Binds which will bind the pet battle functions to different keys. Example, you can press "F" to exit the battle, or "T" to pass.

    The addon is here:
    https://www.curseforge.com/wow/addons/battle-pet-binds


This really came in handy when I went thought arm & hand surgeries because pet battles were the only things I could do in the game while recovering, and I could only use one hand.

I hope thats what you're looking for?
IIRC the pet battle action bar's keybinds are by default Action Bar 1's 1 - 4 (or is it 1 - 6) bindings.

Key Bindings can be changed in the Key Bindings interface.

You have an option to create 2 Key Bindings for each button, and if you don't want to screw up your main character key bindings, you could use the alternate key binds for the pet battle key binds.