I have never put a toilet in but am ready to try. I have a concrete floor in the basement. There is an opening with a black cover which has some concrete covering parts of it. When I take off the black cover how/what do I attach the toilet to the floor?? I have the jellied ring to prevent leakage, but do not know how to secure the toilet to the floor. There will be linolium covering the floor. I know I can do this , just need some helpful hints. Thank you. Joyce