To install a package in Node.js, you can use the npm (Node Package Manager) command-line tool.

Here are the steps to install a package:

1. Open your command prompt or terminal window.
2. Navigate to the directory where you want to install the package.
3. Type the following command: `npm install <package-name>`
4. Hit enter to run the command.
5. For example, if you want to install the `lodash` package, you would type `npm install lodash`.

This will install the package and all its dependencies into a node_modules directory in your current working directory. You can then use the package in your Node.js application by requiring it in your code. For example:

```typescript
const _ = require('lodash');
// Use the lodash package here
```
    
Note that the `npm install` command can also be used with various flags and options to customize the installation process. You can learn more about these options by typing `npm help install` in your terminal.
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