Edit your svn_access_file

This example is for a repo called foo.

[groups]
admin = jsmith
foo_mgt = dapeople
foo_dev = gwashington, bclinton, rreagon 
foo_qa = rnixon, alincoln
everyone = @foo_mgt, @foo_dev, @foo_ga
...
#
# Establish Repository Access by Group.
#
[foo:/]
@admin = rw
@foo_dev = r
@foo_qa = r
[foo:/branches]
@admin = rw
@foo_dev = rw
@foo_qa = rw
@everyone = r
[foo:/tags]
@admin = rw
@foo_dev = rw
@foo_qa = rw
@everyone = r