Here are the controls for each of the tools that you'll obtain during the course of the story:

Throwing/Fishing

Equip the item you want to throw or the fishing rod in your primary equipment slot. Once they're equipped, tap and hold on your Scout then drag away from the direction that you'd like the bobber or the item to go then release.

Note: For fishing, tap the screen to reel in the bobber ideally when a fish pulls on the lure. This is indicated by a large splash.

Powerwasher

Equip the powerwasher in your primary equipment slot. Once it is equipped, tap and hold on your Scout then drag away from the direction that you'd like to powerwash. Make sure to keep holding until the structure or object is clean.

Catching Critters

Equip the critter net in your primary equipment slot. Once it is equipped, stand beside a critter, tap and hold on your Scout, drag away from the direction of the critter, then release.

Photography

Equip the camera in your primary equipment slot. Once it is equipped, tap and hold on your Scout then drag the frame away from the scene you want to capture.

Dowsing Rod

Equip the Dowsing Rod in your primary equipment slot. Once it is equipped, observe the icon on your head to see if you are near or far from a relic.

A snowflake indicates that you are far from a relic, while a fire indicates that you are near one. The bigger the icon, the further or nearer you are from a relic. When the fire icon, becomes bigger, an X will show up on the ground. Simply click on the X to obtain a relic.

Other Tools

Some tools don't need to be equipped in your primary equipment slot. Shovels, machetes, and pickaxes only need to be in your backpack so you can interact and gather resources from dirt mounds, shrubbery, or rocks.