First check the follwoing config if required:
"If you installed the BOINC client anywhere other than the default installation location, you'll need to specify where you installed BOINC in the gridcoinresearch.conf file.

• Windows: (Note the double backslashes are neccessary. Change location according to your non-default install location)
  boincdatadir=D:\ProgramData\BOINC\
  boincappdir=C:\Program Files\BOINC\
• Linux:
  boincdatadir=/var/lib/boinc-client/

You need to use the one email for all BOINC projects. Add this to your gridcoinresearch.conf file (unless the gridcoin wizard has already done this for you):
email=your@email.com"
From http://gridcoin.us/Guides/gridcoin-install.htm

Then follow the guidance here:
http://gridcoin.us/Guides/acquire-grc.htm

Finally to earn GRC from Boinc Research see the "Earn GRC via DPOR" here:
http://gridcoin.us/Guides/earn-grc.htm