Fix Free Shipping Calculation Bug

I purchased an OmniMart eCommerce website and uploaded it on my own hosting with my domain. The website is running, but I am facing some issues that need to be fixed:

Product Add Issue

Currently, I cannot add products.

It shows an error when trying to add a new product.

Email & Verification Issue

When customers create an account, the verification email is going to the spam folder.

I want the email to go directly to the inbox (not spam).

At present, even without entering the verification code, the account gets verified when clicking the link.

I want proper functionality: verification should only happen if the correct code is entered.

Same issue for "Forgot Password" – proper email delivery and code-based verification are required.

Order & Shipping Cost Setup

When customers place an order, I want to set different shipping costs based on specific locations/places.

Example: Certain places will have one shipping cost, other places will have a different cost.

Once the customer selects the location during checkout, the correct shipping cost should automatically be added to the total order price.