Chechbox after installation

Hello everyone!
I'm very noob at NSIS and i need some help, i would like to add 2 checkbox after the install (already checked) for 2 websites, can someone please make and example for me? It would be nice. Please help me, thank you!

Script header -> Pages -> Page settings -> Finish page settings -> MUI_FINISHPAGE_RUN & MUI_FINISHPAGE_SHOWREADME