Please help to install on my domain

Hello
Please help me to install the theme on my domain
I can not install the theme (dark theme) on my site’s domain
Please help me
Because I am active in promoting astronomy
And also because I am poor and I can not pay money
My domain name
fazayebikaran.ir
And my Gmail address
[email protected]

The page I need help with: [log in to see the link]