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Here are the general steps to incorporate the block user function using Node Express and Sequelize Postgres:

1. Create a new database table to store the block information. This table should have columns for the user ID of the person being blocked and the user ID of the person doing the blocking.

2. Create a model for the block table using Sequelize. This model will define the structure and behavior of the block table, and it will allow you to perform CRUD (Create, Read, Update, Delete) operations on the table.

3. Modify the user model to include a block association using the hasMany and belongsTo Sequelize methods. This will allow you to easily query which users have been blocked by a particular user.

4. Create a new route in your Express application to handle blocking requests. This route should check if the user being blocked exists, and if so, insert a new row into the block table with the appropriate user IDs.

5. Add a check in your application's code to prevent blocked users from interacting with each other. This can be done by querying the block table before allowing any action to take place between two users, and denying the action if a block entry exists.

6. Create a new route to handle unblocking requests. This route should delete the appropriate row from the block table, effectively unblocking the user.

7. Test your application to ensure that blocking and unblocking are working as expected.