Step 1 - Build Mifos X
If you'd like to contribute to Mifos X, instruction to build Mifos X are here. Getting set up may take some time - there are some downloads involved - so you may want to move on to the next steps while it builds.
Step 2 - Find something to work on
Step 3 - Fix the issue
Step 4 - Get your code reviewed
Step 5 - Actually get your code in
Step 6 - Repeat
Thank you. You've fixed your first issue, and Mifos X is stronger for it. But don't stop now, go back to Step 2 and find more you can work on.