Can't get into Realms on Minecraft: Java Edition? Due to GDPR (http://minecraft.net/privacy/gdpr/ ) users under the age of 16 need parental consent to play on Realms. To set up parental consent on an account, visit http://minecraft.net/update-account .
Go ahead and select "Other" when asking for an edition of Minecraft. You should be able to fill it out on mobile devices. I would suggest using a different browser if that is the case. ^RL