need help with redirecting user to another screen from a submit button

[Anonymous]

Dear PowerApps Users,

I have a screen where there is a option for users to enter comments, and a submit button having a patch formula as below (to write back to a SharePoint List, once the submit button is pressed) : 

ForAll(Collection1,
If(
LookUp('Approvals Extract',UniqueID= Collection1[@UniqueID],"OK") = "OK",
Patch('Approvals Extract',LookUp('Approvals Extract',UniqueID=Collection1[@UniqueID]),
{'Manager1 Approval Status':"Query",'Manager1 Rejected Reason':TextInput1_4.Text})));
Clear(Collection1)

Once the user press "submit" the following should happen

1) The text entered in textbox should clear

2) The user should be redirected to the main screen "SCREEN1"

I tried to add the navigate functionality within the "If" loop but it keeps giving syntax errors. Please help

[Drrickryp]

@Anonymous 

If(!IsBlank(
            LookUp(
                   'Approvals Extract',UniqueID= Collection1[@UniqueID],"OK"
            )
    ), Patch(
             'Approvals Extract', 
              LookUp(
                     'Approvals Extract',UniqueID=Collection1[@UniqueID]
              ), {'Manager1 Approval Status':"Query",
                  'Manager1 Rejected Reason':TextInput1_4.Text}
        ), 
     false
 );
If(            // check if there were any errors when the patch was submitted
   !IsEmpty(
            Errors('Approvals Extract')
     ),                        
     Notify("submission failed", NotificationType.Error),  // if true, show any error message
     Clear(Collection1)
)