In order to do transactions on the wax blockchain (buying JTG NFTs, token transfers, trading, etc) you need to get resources for your wallet. The resources are CPU, RAM and NET.
If you are just getting started we recommend staking 10 wax to CPU, buying 2 WAX of RAM and staking 1 WAX to NET.
You can do this on WAX wallet dashboard.
The below photo shows where to click to open the resources section of the WAX wallet.
The second photo below shows you how to actually stake the WAX in your WAX wallet.