switch(config)#line vty 5 15
switch(config-line)#password blablabla
switch(config-line)#exit
switch(config)#enable password blablabla
You must set a password on the virtual terminal. If you want to telnet to the router, you must also set a password on line vty 0 4 as well. Hope this helps.
Tim---CCNA, CompTIA A+, Network+, father of 2, husband, tired, help me...