Both Finnish and English versions of Oidom are currently available.
You can change the interface language in your account settings. You can find your account settings by clicking the icon at the bottom left corner of the dashboard view (that opens after you login in). From the settings you can change the language from the drop-down menu (Language/Kieli).
Please note that the language of the sample content on the page you are working on depends on the content language set on the page.