Install the Supabase JavaScript client in your project.
```bash
npm install @supabase/supabase-js
```

Initialize the Supabase client in your application code:
```javascript
import { createClient } from '@supabase/supabase-js';

const supabaseUrl = 'https://PROJECT\_REF.supabase.co';
const supabaseKey = 'YOUR_ANON_KEY';
const supabase = createClient(supabaseUrl, supabaseKey);
```

Use your GraphQL client (like Apollo Client) to make queries to the Supabase GraphQL endpoint.

Example using Apollo Client:
```javascript
import { ApolloClient, InMemoryCache, gql } from '@apollo/client';

const client = new ApolloClient({
uri: 'https://PROJECT\_REF.supabase.co/graphql',
cache: new InMemoryCache(),
});

client.query({
query: gql`
query {
your_table_name {
id
column1
column2
}
}
`
}).then(result => console.log(result));
```