A few ways do do this
either
a) include the full path in the textbox
b) hardcode the path into the code eg.
objApp.Documents.Open "C:\Processes\" & strDocName
c) find the dynamic path eg Docs Folder in the root of your Db
'Extract Database Path for documents - this example gets path of table - tblDocumentList in my case in the BE database
Set MyDb = CurrentDb
strDbPath = MyDb.TableDefs("tblDocumentList").Connect
strDbFile = Dir(Mid(strDbPath, 11, Len(strDbPath)))
strDocPath = Mid(Left(strDbPath, InStr(strDbPath, strDbFile) - 1), 11, Len(strDbPath)) & "Docs\"
or to get the currentDB path
Dim MyDb As DAO.Database, strDbPath As String, intCharacter As Integer
Set MyDb = CurrentDb
strDbPath = MyDb.Name
intCharacter = InStrRev(strDbPath, "\")
strDbPath = Left(strDbPath, intCharacter)
HTH