contacts there but not available when writing emails

I am a new user of Em client.  I put the contacts and my account details  in earlier.  I had a lot of trouble with emails disappearing into trash and eventually took my email account off all my devices and reinstalled it on this PC running Windows 10. My contacts are still here but do not appear when I try to send an email.

Hi Irene,
sorry for the late reply, but can I just ask what do you mean that they do not appear? Do you get no hints when you try to type the address in the To: field or are they not there when you open the Select recipient window?