Connect to Oracle

hi everyone

I have installed Oracle 10g R2 (10.2.0.1) on Solaris 10. The machine issunfire E6900. The installation is done by oracle user. The user is anOS user and belongs to two groups: oinstall and dba. By oracle user Ican connect to Oracle DB by using SQLPlus. Now I have created another OSuser. The user name is elink and the primary group of that is comptel.How can I connect to Oracle DB by this user (elink) using SQLPlus?