Welcome to OpenMRS Community. First, you need to introduce your self at here and then continue the process. Please take a look at this page to start contributing to the community. https://wiki.openmrs.org/display/docs/Getting+Started+as+a+Developer.
While working for GSoC proposal, you need to be active in OpenMRS Community and need to earn dev/1 stage. You can use the OpenMRS wiki pages for more information about the community and projects. please use the OpenMRS issue tracker for the issue management.
Good luck 