Install the SuiteApp

To install any SuiteApp,( here we are installing Celigo integrator.io on Suitescript 2.0)

1. Sign in to NetSuite.
2. From the Customization menu, select SuiteCloud development > SuiteApp marketplace. 
3. In the SuiteApp marketplace, search for Celigo integrator.io.
4. Click the Celigo integrator.io on SuiteScript 2.0 tile.
5. Once on the Celigo integrator.io on SuiteScript 2.0 page, click Install.

Also can do this installation from integrator.io

When creating an export or import using SuiteScript 2.0, integrator.io will try to confirm whether Celigo Integrator on SuiteScript 2.0 SuiteApp is already installed in your NetSuite account. If it cannot be confirmed, you are presented with a hyperlink to suggest you install the SuiteApp.

Once logged in to NetSuite, you will be redirected to the page shown below. Click Install to proceed.