To generate a public key, see the FAQ at savannah.gnu.org/faq/?group_id=5802&question=User_Account_-_How_do_I_configure_my_SSH_access.txt
What you need to copy/paste looks like this: (If not, check the FAQ.) If your key gets truncated, it is probably because your browser
limits the maximum length of the text fields. Try with Firefox, which
is is known to work.
The public key is commonly located in
~/.ssh/id_dsa.pub
.