sweet bell peppers

my sweet peppers are in the greenhouse
should i put them out side if so should i plant then in the ground or can i leave them in pots
they are about 12" tall one's going a bit yellow
there in 6" pots
hope some one can help 

Mine are in big pots (the supermarket flower buckets) so that they can go outside on a good day, to help with pollination, or stay inside if the weather takes a turn for the worse.

That's covered all bases I think