There are a few ways you can do this.
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The simplest is to just add a link from your website to the login page (e.g.
http://myclientarea.quickfile.co.uk). -
If you want to retain the URL your site runs under you could iFrame the login page and link to that.
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For more sophisticated integrations (i.e. without secondary logins) there are some functions in the API to request tokenised links to the client area (Client_Get method). This method would be ideal if you were asking the client already to login into your system and you wanted to provide a link direct to their client area in QuickFile, without asking them again to login.