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http://www.wpfangirl.com/2014/use-genesis-enews-extended-constant-contact/

STEP 1 – In Constant Contact, view SignUp tools. Create Sign-Up Form. 
STEP 2 – Option 1
Use either generic sign-up form or create additional sign-up form. View button and GET CODE (from BGA):
<!-- BEGIN: Constant Contact Email List Form Button --><div align="center"><a href="http://visitor.r20.constantcontact.com/d.jsp?llr=mahggocab&amp;p=oi&amp;m=1102135368716&amp;sit=szufmlkdb&amp;f=dfcb3c0d-9e19-4491-82da-be018095b6e2" class="button" style="background-color:#e8e8e8;border:solid 1px #5b5b5b;color:#5b5b5b;display:inline-block;padding: 8px 10px;text-shadow:none;">Sign Up Now</a><!-- BEGIN: Email Marketing you can trust --><div id="ctct_button_footer" style="font-family:Arial,Helvetica,sans-serif;font-size:10px;color:#999999;margin-top: 10px;" align="center">For Email Newsletters you can trust.</div></div>

STEP 3 – Option 1
Use the above code inside the ENEWS EXTENDED widget. The values get placed in this way:
Form Action:
http://visitor.r20.constantcontact.com/d.jsp

E-Mail Field:
ea

Hidden Fields:
<input type="hidden" name="llr" value="mahggocab">
<input type="hidden" name="p" value="oi">
<input type="hidden" name="m" value="1102135368716">
<input type="hidden" name="sit" value="szufmlkdb">
<input type="hidden" name="f" value="dfcb3c0d-9e19-4491-82da-be018095b6e2">

STEP 2 - Option 2
Go to Constant Contact and copy the “Share Sign-Up Form” link (from Zamir):
http://visitor.r20.constantcontact.com/d.jsp?llr=p54cesbab&p=oi&m=1101193641935&sit=pwovz5dbb&f=63bb67fd-267d-448a-befe-6efd15070e15



STEP 3 - Option 2 - Use the values in the above code this way:
Form field:
http://visitor.r20.constantcontact.com/d.jsp

<input type=”hidden” name=”llr” value=”p54cesbab”>
<input type=”hidden” name=”p” value=”oi”>
<input type=”hidden” name=”m” value=”1101193641935”>
<input type=”hidden” name=”sit” value=”pwovz5dbb”>
<input type=”hidden” name=”f” value=”63bb67fd-267d-448a-befe-6efd15070e15”>