There are two ways of running scripts

One. You can use the ExtendScript Toolkit to write and run scripts. Just write your code and select the target application from the dropdown menu on the upper left corner of the script window. Than hit the run ▶ button or press [cmd+r]. Your computer will switch to the target application and try to run the script.

Two. You can place a file with the extension ".js" or ".jsx" in the Scripts Panel folder. There are 2 different "Scripts Panel" folder. One in Applications/Adobe InDesign[VERSION]/Scripts/Script Panel/ and one under Users/[username]/Library/Preferences/Adobe InDesign/[version]/[language]/Scripts/Scripts Panel. The one within the Application folder makes scripts accessible for all users. Access the "Scripts Panel" via Window > Utilities > Scripts.

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To install script into Photoshop, you need to copy your script file to the following directory:

[Your Adobe Photoshop App path on your OS]/Presets/Scripts

For example [Windows]:

_c:\Program Files\Adobe\Adobe Photoshop CS6 (64 Bit)\Presets\Scripts_

_c:\Program Files\Adobe\Adobe Photoshop CC 2014\Presets\Scripts_

Basically, ther is 4 ways to run scripts in Photoshop:

1. Drag and Drop script file in Photoshop window.
2. Via menu command File>Scripts>Browse... then navigate to script file.
3. Via menu command File>Scripts>[Your script name], after you installed it (do not forget to restart Photoshop).
4. From ExtendScript Toolkit see this instructions.

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