Tap the HorizontalMenu icon (upper-left) then tap Settings.
Tap Export to .vcf file.
If prompted for app permissions, review the info then tap ALLOW to continue.
Tap the Horizontal Menu icon to view save locations.
Tap the name of the memory card.
The name varies depending upon the type of card used.
If the memory card location doesn't appear, navigate: VerticalMenu icon > Show SD / Memory Card then tap the Horizontal menu icon to return to the 'save to' location.
If necessary, navigate to the desired save location.