The Tabantha Tower is located in the same area as Rito Village so you will probably want to activate it to make your life easier. The Tower is easily found by following the footpath from the Tabantha Bridge Stable, but you will notice something...off...about it.
Yep, the Tower has been overtaken by none other than Calamity Ganon. To navigate around this area and get to the Tower you will need to locate the eyes and shoot them. Beware of monsters like Lizalfos and Bokoblins hanging around too.
The entire vicinity of the Tower is blocked off from foot access unless you can locate and destroy this eyeball here. After it is gone, the goop will vanish and leave behind a narrow path you can proceed through to get to the Tower.
The Tower is surrounded by a pool of goop. Without something like Revali's Gale and precise timing and aim (which can bypass this entire challenge), you will want to climb onto one of the pillars near the Tower and have a look around. You will see an eye glaring back at you. Shoot it and the column it was stuck to will fall over and become a makeshift ramp you can use to get to the Tower. From there it is a steady and easy climb.