Plants from seed take longer than clones due to the seedling stage that can take a month from sprout for the plants to even show sex. Clones are bangin' and ready to go once rooted in about 2 weeks or less for some strains. If indoor, 12/12 is the determining factor for gauging when they should be finishing. About 9+ weeks from 12/12 is about right for Nirvana. Outdoors is another matter altogether, depending on time of year and the degree of northern lattitude where you live.
Assuming you are working from a PC, laptop, tablet or phone w/gallery files you want to load, hit the Go Advanced tab next to the Reply and scroll down to the Manage Attachments tab in the advanced screen. This will pop up a dialog box where you pick the Add Files tab in upper right corner. Then Select Files at the bottom. Once you load what you want upload 'em and attach (Insert Inline tab in bottom right corner and- Voila!