Excel userform combo box select sheet to put values in - vba

Question

Hi i am trying to program a user form in excel that a user inputs the information and can select the worksheet that they want the information that was entered in to go to that spread sheet.
This is what i have so far.
Dim iRow As Long
Dim sheet As String
sheet = ComboBox1.Value
Worksheets(sheet).Activate
iRow = sheet.Cells.Find(what:="*", seatchOrder:=xlRows, searchdirection:=xlPrevious, LookIn:=xlValues).Row + 1
when i run the user form and select the worksheet in the combo box and hit the command button to run the form i get the error "invalid qualifier"
it highlights sheet.cells
here is the entire code if it helps:
Private Sub ComboBox1_Change()
End Sub
Private Sub CommandButton1_Click()
'get item button
Dim sheet As String
UserForm8.Hide
MsgBox ("Select an item to update")
sheet = ComboBox1.Value
Worksheets(sheet).Activate
Set ProjRng = Application.InputBox(Message, Title, "", 377, 58, , , 8)
ProjSel = ProjRng.Cells.Row
Label1.Enabled = True
Label2.Enabled = True
Label3.Enabled = True
Label4.Enabled = True
Label8.Enabled = True
Label10.Enabled = True
TextBox1.Enabled = True
TextBox2.Enabled = True
TextBox3.Enabled = True
TextBox4.Enabled = True
TextBox8.Enabled = True
TextBox10.Enabled = True
TextBox10.Locked = False
CommandButton1.Enabled = True
ComboBox1.Enabled = True
UserForm8.TextBox1.Value = ActiveSheet.Cells(ProjSel, 1).Value
UserForm8.TextBox2.Value = ActiveSheet.Cells(ProjSel, 2).Value
UserForm8.TextBox3.Value = ActiveSheet.Cells(ProjSel, 3).Value
UserForm8.TextBox4.Value = ActiveSheet.Cells(ProjSel, 4).Value
UserForm8.TextBox8.Value = ActiveSheet.Cells(ProjSel, 8).Value
UserForm8.TextBox11.Value = ActiveSheet.Cells(ProjSel, 6).Value
UserForm8.Show
End Sub
Private Sub CommandButton2_Click()
'Update button to update the remaing quantity amount
Dim iRow As Long
Dim sheet As String
sheet = ComboBox1.Value
Worksheets(sheet).Activate
iRow = sheet.Cells.Find(what:="*", seatchOrder:=xlRows, searchdirection:=xlPrevious, LookIn:=xlValues).Row + 1
With Worksheets("ChemLog")
.Cells(iRow, 6).Value = Me.TextBox12
End With
With sheet
.Cells(iRow, 1).Value = Me.TextBox1.Value
end with
'continue above with columns according to log
End Sub
Private Sub TextBox10_Change()
End Sub
Private Sub TextBox11_Change()
End Sub
Private Sub UserForm_Click()
End Sub
Private Sub UserForm_Initialize()
ComboBox1.AddItem ("Standards")
ComboBox1.AddItem ("Acids,Bases, and Buffers")
ComboBox1.AddItem ("Solvents and Flammables")
End Sub

Answer 1

As well as the spelling error, sheet is a string, so it requires:
Worksheets(sheet).Cells.Find(..
which is the reason for the specific error message you receive.