Open console by pressing the ` key (beneath Esc)

and type: bind <key> <command>

(dont type < or >)

 

for example:

 

bind i shopmenu

bind "i" "shopmenu"

 

i recommend using these:

 

bind "-" "amx_menu"                   - key opens client/admin menu

bind "i" "shopmenu"                     i key opens shopmenu

bind "o" "shopmenu2"                 o key opens shopmenu2

bind "mwheelup" "wcrepair"         z key repairs teammates armour

bind "mwheeldown" "wcmend"     x key mends teammates wounds

bind "p" "war3menu"                   p key opens war3menu

 

If you have problems binding keys in-game, try adding the bind in your config.cfg file (in your cstrike folder) in the following format:

 

bind "i" "shopmenu"