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-At the "Review and Payment" screen there are two instances of "Pay With Credit Card". The second should say "Pay using PayPal" because right under that one it says "Click here for this payment option" and that switches to PayPal. How do I change that text?
If you use "Online Payment Manager", make sure the PayPal Option settings show PayPal under Payment Type...it probably says Credit Card.
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-How do you disable the popup "Thank you, you are now logged in" after a user logs into the store?
I don't know if it's possible to remove the pop up when someone logs in.
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-How can I add link lines (to indicate that they are links) under the following: Login-Address-Order Options-Review & Payment ?
If you are referring to the checkout pages 'breadcrumbs' you can't access the code for that.
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-Is there a way to remove the "Powered by MonsterCommerce..." text from the bottom?
Go to Site Wide Settings > General Storefront tab and change "Display MonsterCommerce Copyright" to "No" then click SAVE.