I have one red,black and white wire and one black and white wire.
I am trying to wire them to the unit which has one blue, one black, two white and one green
Can you please help

I have one red,black and white wire and one black and white wire.
I assume this is in the ceiling at the fan?
What do you then have at the switch?

Bathroom fans/lights need a 20 amp circuit GFCI with 12 gauge wire and two switches. Both switches are fed via the incoming black wire, the one switch goes to fan black and the blue goes to the light hot. Green is ground and white is a common neutral for both fan and light. Do you have two switches, the red tells me likely yes.

Slight correction, according to the 2008 edition of the NEC, 210.8(A)(1); only the receptacles are required to be GFCI protected in a bathroom.

What we need to know is the mapping of the wall switch(es) that control the light/fan device.

We also need to know where is the source for the power to the device. Is it at the wall switch(es) or is the source brought to the ceiling and then routed to the switch(es) and back to the device. This would be called a switch loop.

Connect the blue and black to control with 1 switch, red and black may be separate switch legs and could control them separately.
What do you have at the switch location?

Bathroom fans/lights need a 20 amp circuit GFCI with 12 gauge wire and two switches.Just a correction.

Bath fan/lights do not need a 20A circuit, nor do they require GFI protection, unless of course the manufacturer requires it. Most only require GFI protection if a fan is installed over a tub or shower.