Userform calculator only performing the last 2 buttons clicked.

I have found a code on a site that allows me to make a userform calculator. It works fine except that it won't add, subtract, multiply or divide more than 2 numbers. meaning if I enter in 2 + 2 and hit the equals button it gives me 4. But if I hit 2 + 2 + 4 it gives me 6 instead of 8. Below is the code I found and am using and this one is in module4

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and here is the code that's on the userform.

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Could someone please help me out with getting this to do more than just the last 2 numbers

Thanks in advance

Great thank you!

Well I managed to upload it somehow but I can't seem to attach it to this.

Well I had to take my workbook apart to get that. But it loads when I click on a sheet. So I have it set at

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But what I want it to do is to be able to calculate more. Right now it only adds, subtracts, multiply or divides with the last 2 numbers pressed. So if wanted to add 3 + 3 + 8 i would like it to show me the answer of 14 when I hit equals. But it will only show me 11 because those were the last 2 numbers I pressed.

I don't want it to put the end value anywhere. Just want to be able to use this calculator on the screen in place of using the one next to my desk. This workbook will be used by many so I'm attempting to make it easier by having this already on the screen.