reset, still blinking amber. disk utility does not recognise

my friend gave me two airport expresses

Please look on the side of the AirPort Express(es) to locate the Model No of the devices. What are they?

i reset them

There are 3 different types of resets. Please tell us exactly how you reset both devices.

disk utility does not find them

You would not use Disk Utility to configure the AirPorts, you would use AirPort Utility.

If you meant to say AirPort Utility, we need to know which version of AirPort Utility you are using.

If you do not know.....open AirPort Utility, click the AirPort Utility menu in the upper left corner of the screen, then click About AirPort Utility. Post back with the version number that you see there.

Finally, the AirPort Express can be configured in different ways. We don't know what you are trying to accomplish with the AirPort Express devices on your network. What service do you want them to perform?