I'm sure tom meant to give you this link: https://www.helpfulgardener.com/forum/viewforum.php?f=36
Browning already is not a good sign. I expect your screened porch with morning sun only is not enough light for it. None of the light would be direct. Your juniper tree needs to be outside, year-round, in a bright spot with lots of sunlight. The juniper cannot live indoors or in too much shade.
Be careful not to over water. Juniper doesn't like to stay in wet soil. When you water, water thoroughly so water is running out the drain holes, but then don't water again until the soil has dried. It should be in good bonsai soil which is gritty, mineral and very free draining, not like regular potting soil.
If you still have concerns, please post a couple pictures of your tree.
Welcome to the Forum! Best Wishes with your new little tree.