Step 1: After installing Polylang plugin, it will redirect to Setup Wizard or you can click Run Setup Wizard.
Step 2: Select languages => click Add new language => Click continue.
Step 3: Enable/disable allow Polylang to translate media => Click continue.
Step 4: Select default language => Click continue => Return to the Dashboard.
Step 5: Go to Languages => Settings => Click Settings of Custom post types and Taxonomies.
Step 6: Enable all post types and taxonomies that you want to translate => Click Save Changes.