I’ve already answered that directly to the email you sent (as you will know)
but in case someone reads this and has the same question :

logo:
you’d have to use css / background images (assuming your email type is set to html of course , otherwise adding images is not going to work anyway) in the css customisation of each template
typically in
Section Styles – Site Details -> Table
where the default would normally be
padding: 30px; text-align: center; background-color: #21759B; color: #FFFFFF;

footer text :
the footer text can be set in
wppizza->localization -> Templates Other->Footer : text after summary / totals [html allowed – use linebreaks for newlines in plaintext output]

PS:
i believe there might still be some legacy (v2.x) localization strings that are not even used any more in v3 and should be deleted from the plugin
however, i need to take a little bit of time at some point and do this carefully so as not to delete the wrong stuff…
(furthermore, some localization strings would no doubt benefit from being re-organized into their respective / appropriate sections … a “todo” on my behalf in a near future update)