Greenhouse Newbee ?

What is the best and safest way to use this greenhouse for some of my houseplants. It sits in full sun most of the day and I dont wont to fry the plants. Please give any advise, my plants will love you for it :>)
Thanks
Christine

If I were you, I'd take the plastic off during the day and just put it back on at night if you're trying to protect them from nights that are still chilly, and as soon as your nights are warm enough I'd just take the plastic off completely. But I've never used one of those greenhouses so I don't know if they get as hot inside during the day as a regular greenhouse woudl, it could be if you just unzip the front all the way during the day that'll keep things cool enough without taking the plastic all the way off.

The most important thing is going to be acclimating your plants gradually to the sun--even if you had them in a bright window indoors, the light is not nearly as intense as full sun outdoors, so if you move them out full time into the sun the leaves can sunburn, it's best to do it gradually, put them out for a little then bring them in, and gradually increase their time outside until they're out there full time. My apologies if you already knew this or if the plants have already been outside long enough to be adjusted, but in case you didn't know it I figured it was worth mentioning.