Hello Bert,
Thank you for your message, and apologies for the inconvenience.
Regarding your first question about changing the “Sign in” text, may I ask which template you are currently using? The availability and location of that label can vary depending on the template, so this information will help us guide you properly.
Regarding the second issue with the 404 error when deleting the last item from the cart, please verify that the correct product page has been selected under:
EasyStore → Settings → Products → Shop Page
(as shown here: https://prnt.sc/ZkpLaCpgIQRf)
Configuring this setting correctly generally resolves the issue you described.
If the problem persists after this adjustment, please let us know and we will gladly investigate further.
Kind regards