How to buy RLB on MetaMask?

Excuse me, could you please elaborate on the process of acquiring RLB tokens using MetaMask? As a novice in the cryptocurrency realm, I'm a bit confused about the steps involved. Could you guide me through the process, including setting up my MetaMask wallet, ensuring it's secure, finding the right exchange or platform to purchase RLB, and finally, executing the transaction seamlessly? Your step-by-step assistance would be greatly appreciated.