Populate Form From Row In Sheet

how I populate a form with values from a row in my excel sheet that i selected in a multicolumn textbox.

My "tool" works like this... The user opens the excel file and can choose one of two buttons, Add defect and Find defect. When the Add button is clicked Form1 is opened and the user fills in a number of fields which are then inserted into an excel sheet (same book though). Then there's the Find button. When the user clicks this button Form2 opens with a multicolumn textbox that displays some of the columns with some of the previously inserted information. Now I would like to be able to select one row and get Form1 populated with the values for that particular row. The user should then be able to change some of the values and the changes should be inserted back into the correct row in my excel sheet. How in the world do I do this??? Right now I just open my Form1 when I select a row and click an OK button. How do I get the values from my excel sheet back into my fields?I've tried to copy code from an example I found, but I can't get it to work.

My first form where I add my data


Private Sub UserForm1_Initialize()
Dim rIds As Range
Dim MaxId As Long

Set rIds = Worksheets("Systemtest").Range(Cells(1, 1), Cells(Rows.Count, 1).End(xlUp))
MaxId = Application.WorksheetFunction.Max(rIds)
With Me
.IdBox.Value = MaxId