For adjusting the input tax credit, please follow below mentioned steps
Step 1: Go to display menu and then GST Summary
Step 2: Ensure your balance tax payable and ledger balance both value should be matched.
Step 3: Press F4 to adjust the CGST,SGST, IGST output balance to adjust with input balance.
Step 4: Press F4 for adjusting output bal(if any) with input balance of other head.
Step 5: Debit balance of all heads wil carry forward in next month automatically and credit balance, you need to make payment at the end of month in GST payable account.