How to install full-text search on an existing database?

In case there is a need to install full-text search on existing database.
Full-text search (FTS) support

1. Start the installation and select “New SQL Server stand-alone installation or add features to an existing installation”.

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2. Press next until you get to the Installation Type screen.

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3. In the Installation Type screen pick the instance you wish to add this feature to and then press Next.

4. Check the checkbox next to the Full-Text and Semantic Extraction Search before moving on.

5. You can press the next button on the next screens until the installation is complete.