In Anki, open File → Export, and choose "Cards in Plain Text" as the export format. This is the format EverRecall can read most easily.
After picking the deck, just export it — you don't need to change any export settings.
The same is true if you export as an Anki package (.apkg / .colpkg) instead. Just export it with the default settings.
Send the exported file (.txt or .apkg) to your iPhone or iPad.
Once the file is on your iPhone or iPad, touch and hold it (or tap the share button) and choose "Open in EverRecall" from the share sheet. This takes you straight to EverRecall's import screen.
Some things don't carry over from Anki. Please keep this in mind before you start:
Drop .txt or .md files into the iCloud Drive → EverRecall folder (in the Files app), and EverRecall automatically scans it every time you open the app — adding only the newly placed files as cards.