If the responses are already given for the section and you are not able to click on the finish button or the finish button appears as disabled, follow the below troubleshooting steps to resolve the same.
Wait on the same page without performing any action for almost five minutes. Within five minutes, the finish button will get enabled and you will be able to click on the Finish button and submit the section.
If there is no 'Finish' button or any options visible on the screen, click on the three settings icon in green color on the top right of the page to get the options on the page.
If you have already click on the 'Go Back' option, please refresh the page using Ctrl+Shift+R and then wait on the same page for five minutes to get the finish button enabled and submit the section of the assessment.