How do I add arbitrum to my wallet?

Hello there, I'm curious about how to add Arbitrum to my cryptocurrency wallet. Could you please walk me through the process step-by-step? I'm relatively new to the world of decentralized finance and want to make sure I do it correctly. Is there a specific wallet that supports Arbitrum or can I use any wallet? Also, are there any fees involved in adding Arbitrum to my wallet? Your guidance would be greatly appreciated. Thank you!