Normally kodi will auto update, but if you want to manually check do the following

KODI  ESTUARY SKIN

From kodi home screen click > ADD-ONS > MY ADD-ONS > click the SIDE PANEL on the left > CHECK FOR UPDATES

Any updates you will see them top right

While you are there, click SETTINGS > ADDONS >on the right make sure it`s set to INSTALL UPDATES AUTOMATICALLY

KODI  CONFLUENCE SKIN

From kodi home screen click > SYSTEM > ADDONS > click the SIDE PANEL on the left and make sure AUTO UPDATES are ON > click CHECK FOR UPDATES

Any updates you will see them bottom right.

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