I have arcGIS 10.3 and have 100 users portal for ArcGIS, I want to use the portal for ArcGIS but I don't know how. I installed Portal for ArcGIS and it still keep telling the software is not licensed
After installing portal you need to authorize it, separately from authorizing ArcGIS Server. This can be done by going to the start menu in windows server, selecting ArcGIS -> Portal for ArcGIS 10.3 -> Software Authorization. This will start the software authorization process and it will prompt you to authorize over the internet or select authorization file.