Maintenance for the week of November 18:
• PC/Mac: No maintenance – November 18
• ESO Store and Account System for maintenance – November 19, 9:00AM EST (14:00 UTC) - 6:00PM EST (23:00 UTC)
• PlayStation®: EU megaserver for maintenance – November 19, 23:00 UTC (6:00PM EST) - November 20, 17:00 UTC (12:00PM EST) https://forums.elderscrollsonline.com/en/discussion/668861
Do you mean you got your first "house" through the housing quest, but want to buy a second? If so, visit the house you want in the Crown store, through the in game map, through the housing option of the collections tab, or by visiting the house you want.
Once inside enter the housing editor choose to buy for crowns or gold.
Sorry if I've misunderstood what you were asking for.
#1 tip (Re)check your graphics settings periodically - especially resolution.