First you will need to set up a mechanism. This can be done with a text editor such as Windows notepad. If you use a word processing program such as MS Word, you must save the mechanism in a text format.
Species names can be complex.
2AB3O4 is 2 molecules each with 1A, 3B's and 4 O's. After compiling the mechanism, choose M and load the simulation file, filename.sim. From the menu, choose C to enter concentrations. Delta time requires some explanation. Therefore, unless the program crashes, it is best to use a relatively large value.