Once you link a Hive wallet to one GLG account, you cannot link it to another GLG account. However, you may use any wallet to pay for packs.
Step 1: Make a GLG account and sign in. Click the white circle in the upper right corner. Then click on Wallets.
Step 2: Fill in the name of the wallet you want to connect in the "Link Hive Wallet" field and click Link with Keychain.
Step 3: Hive Keychain will pop up and ask you to sign a message with your posting key to confirm you own the account. Click Confirm.
Step 4: You will get a confirmation in the upper right corner letting you know that your Hive Wallet was linked to your account.