To send an invitation to your candidate you will:
1) Login to your account
2) Select the company from the left hand company association menu
3) Select the package of interest (this will normally be the first package in the list)
4) Select the 'Click here for invitation template' from the middle of the package info page
5) Copy the template to your email client making the necessary changes for your company or create a completely custom email and use the link shown on the page.