Help adding inputbox values

I need help adding together two values that are entered by the user. Throughout this spreadsheet, I have only had to write one value to a cell which was easy. I'm not sure how to "add" the two values before sending the total back to cell B50. See portions of my code below. I have defined sUserInput12 and 14 as a string up til now....

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If anyone could educate me on how to do this, I would really appreciate the help!
Thank you -

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Thanks - that worked except it was rounding the total, so I changed it from CSng to CDec and all is good! Thanks for your quick response.