Step 2 of 3. Visit Chainlist.org and connect the Arbitrum One network to Metamask (1-click).
Step 3 of 3. Load AETH (Arbitrum-ETH) into your Metamask wallet.
You'll need AETH to pay gas fees for most interactions on Ideamarket. Rating, posting, and staking tend to cost less than $2 in gas fees. (You can set up your User Profile without paying any gas fees.)
Get AETH in one of 3 ways:
Buy AETH using credit or debit via Transak, Banxa, Binance, or any other fiat—>AETH on-ramp. Make sure you select Arbitrum Network. (AETH = Arbitrum ETH)
Bridge ETH to Arbitrum from another protocol (such as Polygon) using Hop Protocol.
Bridge ETH to Arbitrum from Ethereum Layer 1 using the Arbitrum Bridge. This tends to cost $25-50 in gas fees, even if you're only bridging a small amount.
With a Metamask wallet loaded with AETH, you're ready to go!