the procurve mini-gbics use slightly different release mechanisms, but the insertion process is virtually the same for all.
to install a mini-gbic in the 10-port mini-gbic module:
1. orient the mini-gbic as shown in the illustration below. note that the release mechanism is on the left of the receptacle.

2. insert the mini-gbic into the receptacle until it locks into position.
if the mini-gbic does not go in easily, do not force it. if the mini-gbic is not oriented properly, it will stop about one quarter of the way into the slot—remove and reorient the mini-gbic so that it slides easily into the slot.
keep the dust plug in the mini-gbic when there is no fiber cable plugged in. the optics will not work properly when obstructed with dust or contaminants. it is recommended that you clean the optic surfaces of the fiber cable prior to plugging it into the optical bores of the mini-gbic.