Having problems trying to pay employee tax to hmrc. says update details but when i sign in with my password it allows me in but cant find anything to change?

Welcome to QuickBooks Community, @shanklinbuilders! I'd like to help you proceed with paying your employee tax to HMRC.

First, can you share the exact error message occurred when trying to pay employee tax to HMRC? I would also recommend checking some error codes and knowing how you can fix them right away. Each error you'll receive provides different solutions.

Next, ensure to double-check your employee details and make some changes (if needed).

1. Go to Payroll and select Employees.
2. Select the employee's name.
3. Complete the employee’s information in the different sections.
4. Save your changes.

For more details, feel free to visit this article: Add, update an employee record in QuickBooks Online.

If the same thing happens, please contact HMRC directly for further assistance.

For more help on managing employees and payroll, you can check out the links below:

•  Standard Payroll 
• Advanced Payroll 

Please let me know how everything goes. I want to make sure you're all set. Just in case you still need help with this matter or have any other QuickBooks concerns, just add another post below. Take care and stay safe, shanklinbuilders.