Now a window should pop-up where you can select the preferred wallet type and finalize the purchase.
If the transaction does not go through for some reason, the area will be blocked under your name for a few days. Once the failed transaction gets cleared, the land becomes available for anyone to buy. If you want to finalize a failed transaction, go to the My Lands page - here you can retry with clicking on PURCHASE once again. The speed and success of a transaction depends on the congestion of the network, so please be patient!