How do I add an arb to MetaMask?

Could you please explain the steps to add an arbitrage token, or arb, to MetaMask, the popular cryptocurrency wallet? I'm interested in expanding my portfolio and would like to know the process of integrating new tokens into my MetaMask wallet. I'm assuming there's a specific process to follow, and I'd appreciate it if you could guide me through the necessary steps, including any precautions I should take to ensure the safety of my funds.