The go back option may not be available due to a variety of reasons. It is important to first determine the cause of the issue before attempting to resolve it. To do this, I recommend the following steps:
1. Check the web page's source code. Look for any errors that may be preventing the go back button from functioning properly.
2. Check the browser settings. Make sure that the browser is configured correctly, and that the go back option is enabled.
3. Try a different browser. If the go back option is still not available, try using a different browser to see if the issue persists.
4. Clear the browser cache. Clearing the cache may help resolve any potential issues with the browser.
5. Contact the webmaster. If none of the above steps resolve the issue, it may be necessary to contact the webmaster for further assistance.