Not able join windows insider program

In your screenshot it says that you do not meet the minimum hardware requirements and your options will be limited. Are you looking to try out Windows 11? If so make sure that your have a TPM 2.0 chip in your system and that you meet the other minimum requirements. Additionally i would not advise you to test this on your primary system. Use a VM or a secondary system to do your testing.

https://www.microsoft.com/en-us/windows/windows-11-specifications