If you have the key lock sign flashing then its usually means the childlock is activated which stops you from using the dryer and changing the cycle.
What you need to do is press and hold the finish in button (picture of the clock) for several seconds and hopefully that turns the child lock off and will allow you to use the dryer again.
Try that and see what happens and let me know.
No worries just check it out whenever you can.
You will have an email with every reply i send so just click on the link thats in the email and it will bring you back to this thread and you can then get back to me if you need to.
Your very welcome.