First you need to locate where your import folder is. In the main import folder you find the HTM files and the CSS files. You recognize a webkeytemplate generated CSS file by the first letter which is P, and then there is six digits representing the projectnumber, six digits representing the page number. Like P000011000002.css.
Then you choose where to store your project. A tip is to gather your project folder under one webkeytemplate folder.
The name in the entryfield is the name of the project you are about to import to webkeytemplate. Now you just have to click the Next step > button.
When you have choosen your new project number, click on the Next Step button.