Making a macro loop

I have a macro which identifies a place using a key text ('BX') in the document , and the next one below it. It establishes two placeholders ('First' and 'Next') , and then deletes the text between.

The only problem is it only works for the first instance of the key text , but then stops.

Can someone suggest a way to modify it so it runs through to the bottom of the document and finds all examples , and not just the first?

Sub Macro8()
'
' Macro8 Macro
'
    Selection.Find.ClearFormatting
    With Selection.Find
        .Text = "BX"
        .Replacement.Text = ""
        .Forward = True
        .Wrap = wdFindContinue
        .Format = False
        .MatchCase = False
        .MatchWholeWord = False
        .MatchAllWordForms = False
        .MatchSoundsLike = False
        .MatchWildcards = True
    End With
    Selection.Find.Execute
    Selection.EndKey Unit:=wdLine
    Selection.TypeText Text:="First"
    Selection.Find.ClearFormatting
    With Selection.Find
        .Text = "BX"
        .Replacement.Text = ""
        .Forward = True
        .Wrap = wdFindContinue
        .Format = False
        .MatchCase = False
        .MatchWholeWord = False
        .MatchAllWordForms = False
        .MatchSoundsLike = False
        .MatchWildcards = True
    End With
    Selection.Find.Execute
    Selection.HomeKey Unit:=wdLine
    Selection.MoveUp Unit:=wdLine, Count:=1
    Selection.TypeText Text:="Next"
    Selection.MoveUp Unit:=wdScreen, Count:=8
    Selection.Find.ClearFormatting
    Selection.Find.Replacement.ClearFormatting
    With Selection.Find
        .Text = "First*Next"
        .Replacement.Text = "^p^p"
        .Forward = True
        .Wrap = wdFindContinue
        .Format = False
        .MatchCase = False
        .MatchWholeWord = False
        .MatchAllWordForms = False
        .MatchSoundsLike = False
        .MatchWildcards = True
    End With
    Selection.Find.Execute Replace:=wdReplaceAll
End Sub

Grateful for any advice.