Thanks for the link.
See the last part?
http://graciepublishing.biz/wp-login.php?redirect_to=index.php That's what's causing the user to be sent to the homepage after login, and it overrides the s2Member setting for the Login Welcome Page.
Try logging in after clicking this link
http://graciepublishing.biz/wp-login.php (I removed the
redirect_to part) and tell me if you get taken to the homepage after that or to the Login Welcome Page in your s2Member settings under
WP Admin -> s2Member -> General Options -> Login Welcome Page.
I'm not sure where you copied that link from, but you'd need to edit it to remove that part. If it's in a widget, maybe you can edit the widget from
WP Admin -> Appearance -> Widgets, but if it doesn't give the option you may need to edit the widget's code. If it's part of your theme, you'll need to edit the template that has that line.
I hope that helps.