Open your chosen NFT and scroll down the page to find the details of the NFT.
To buy the NFT, there are two steps:
Step 1) 'Approve Funds' - to confirm your MetaMask Wallet has the required amount of WMatic to complete the transaction (gas costs included)
Step2) Buy the NFT.
Click the 'Approve Funds" button to start the process.
MetaMask will open and highlight that you are enabling the seller of the NFT to the "Required" amount of WMatic from your wallet in-order to complete the purchase.
Please read the details before you proceed.
Once you are happy with the details in Step 5, please scroll down the MetaMask page and click 'confirm'
Your funds should now be approved and you can now complete the transaction by clicking on the 'Buy' button.
Just like step 5, MetaMask will appear and ask you to confirm the process, once you have read and are happy with the information, please click 'Confirm'.
The last transaction and usually takes a few minutes to complete.
PLEASE DO NOT REFRESH THE PAGE
It can take a bit of time as the network can be busy.