I have a Kenmore sise by side refrig on the left (freezer side) it ices up on the bottom

The drain is blocked.slime builds up in the drain line and then the water freezes in the line,unplug the fridge,melt out all the ice at the bottom of the back panel,you'll see a drain hole there,i use a steemer to blow through the drain line,if you don't have a steemer hit the hole with the hair dryer for a while,then pour hot water into the hole,if the water doesn't drain down the hole try using a turkey baster to blow out the line,or you can try to snake something down the drain hole but be careful,it's made of plastic,when you think it's clear pour hot water down the hole again if it doesn't drain keep hitting it with the hair dryer until the water drains down the hole,sometimes it takes like an hour to free it.