If you are wanting to compose a new email would you not expect the form to be blank?
If you mean there is no menu to select formatting of the email that will be because you are using plain text instead of rich text.
If you want to use Rich Text log onto your email account and click on your user name at the top right. Select "settings" then click on "Mail" in the left hand column.
In the "General Settings" section make sure that the box "Compose messages in Rich Text Format" is ticked then click "Save".
As regards populating the email address with you contact's details you can click on the word "To" and not the email address box. This will bring up your list of contacts and you then select the contact you want. Click on the contact's details then click on "select".
The other way to populate the address is to click in the address box and enter the Initial of the contact. This should bring up all the relevant contacts which you can then scroll until you find the one you want and click on it.
