Container Gardening

Is it okay to use the soil for Container Gardening, gardening
Hello, so today I went to ACE hardware and bought some containers of my vegetables, I did what HTE lady and recommends buying 4 bags of Miracle Gro plant and topsoil, so I have in my garage, but more than reading, I notice that said not to be used in containers! It be okay if they use there? Or not? Help! I can not change them.
That's all I ever use. My seven year-old Meyer lemon tree is in Miracle Gro soil and plant N vegetables doing well. Replant it every time two or three years in the same area, always work very well.
Patio Vegetable Container Garden 3/31/10