Hope you are in a warm zone, osorio? It would help us a lot to know where approximately you are. (there are spots in your personal profile to put your city, and climate zone so they appear automatically in your posts)
Snaps are annuals, and will bloom nicely through the winter here in Florida. They need regular water (pots dry out quickly, and ever more quickly as the plants get bigger) but it depends upon your climate (dry air or humid, how warm?) so just testing the soil with your finger at first will give you an idea how often to water.
They will also need fertilizer. Check if the potting mix you used has fertilizer already added. If not, mix it into the soil around your plants now, while they're small, and then keep an eye out for them to need more in a couple of months. Leaves will be paler, blooming will slow down. A pelleted time-release fert like Osmocote (my fave) will save you from having to remember to mix liquid fert every week or two. In really warm and humid areas, the pelleted fert is used up much faster than the 3 to 4 months it says on the label.
A sunny spot will be good through the winter, but as it heats up in spring, morning sun and shade in the afternoon might keep them going longer. Also you will need to deadhead them. Each time a flower stem finishes blooming, cut it off above the first leaves so that the plant doesn't go into seed production. This will keep the plants producing new flower stems.
If you keep them going through to next spring, you may need to move them to a bigger pot. They'll tell you, by wilting in the heat of the afternoon because they're using up all the water the pot can hold before the day cools off.
