Here is how to do it in MemberSpeed

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There are 2 ways:

 1/ Keep default template

 And go to Navigation Module / hide all links on frontend ( homepage ) -

 Then go to Site Design Module/ EditPages/ Change Home Page/

Select SOURCE and type/copy your html sales letter to the box

OR:

2/ Go to Site Design Module/ EditPages/ Home Page and Special Offer Page Display settings /

 Select no template for homepage.

 Then go to Site Design Module/ EditPages/ Change Home Page/

 Select SOURCE and type/copy your html sales letter to the box
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To remove the default Registration_Form tag

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Go to Site Design Module/Edit Pages/Add/Remove Form Tags

Select NO form tag on home page. Hit save.

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If you remove the form tag on your sales letter/homepage.
You may want to add a SIGN UP NOW link, or ORDER NOW link with graphic.