well sometime seasons doesnt answer in the right time using Extension tool to install skins , modules and etc
the best way and more secure
go to ur FTP and this path
wwwroot/install/modules <-- to install module
wwwroot/install/skins <-- to install skins
and each folder goes by its name
upload ur zipped file skin there and now go to ur browser and type:
sitename.com/Install/Install.aspx?mode=installresources
--
just simple as that
now the access of Admin or Host
well if you want to have access to the all portals and site managment u need to login as ur Host ID name created during installation...
but login in as admin limits ur site access as im sure u have seen it