Hi,
The installation instructions for DSpace 7 can be found online at
https://wiki.lyrasis.org/display/DSDOC7x/Installing+DSpace
If you want an offline copy of the DSpace 7 documentation (in PDF format), it can be downloaded from the "Release Downloads" listed on the DSpace 7 Doc homepage at
https://wiki.lyrasis.org/display/DSDOC7x
Likely, you are missing the steps regarding moving to HTTPS / Production, where we recommend using either Apache or Nginx as a proxy to your frontend and backend. See step 17 of the backend installation and step 8 of the frontend installation. Using either Apache or Nginx lets you run DSpace under your own domain and using HTTPS, both of which are necessary to allow it to work over the internet.
Tim