Step 1 : To buy BEP20 tokens, connect your network in metamask.
Step 2 : Once connected, click exchange button then pancake swap for buying BEP20 tokens.
Step 3 : When you enter the amount in BNB, now automatically how much BEP20 coin receive will be shown.
Step 4 : Click swap button to imitate the buy process, now metamask will opened for confirmation.
Step 5 : Once swap is confirmed, you can see your BEP20 coins on your wallet page.