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The yellow blocks in ScratchJr are the 
trigger blocks.

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You can use them to indicate when a script
should run.

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You can always run a script by tapping on it,

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but if you select start on green flag,

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you can also run a script by tapping the green flag

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at the top of the screen.

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The green flag at the top of the screen

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will also reset the characters to their starting positions

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before running the script, and it will run every script

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that starts with a green flag for every character,

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all at the same time.

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Start on tap will run the attached script

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when the character is tapped on the screen.

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Start on bump will run the script

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when the character is bumped by another 
character on the screen.

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You can use this as a way

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for two characters to interact.

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Another way for two characters to interact

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is by using the message block.

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A character can send a color coded message,

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which will trigger action for another character.

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You have 6 colors from which to choose.

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The color of the message block

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should match the color of the trigger block.

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This is useful for programming interactions

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between multiple characters.