This question is not following the guidelines in: Read before posting: How do I get my question answered?
As you are not describing the particular problem you are trying to solve in any way that is reproducible/comprehensible for anyone but you.
Note that there are several available demos at https://fenicsproject.org/olddocs/dolfin/latest/python/demos.html that are documented and cover a wide range of the use cases for FEniCS.