使用If宏查找具有特定文本的单元格

I have a cost sheet with a lot of Macros in it. One of the Macros is to add a new line item to the bottom of the sheet. I want to enter an If code saying that if the item I add starts with the text "Custom " with a space after I want it to find that cell and select it. Below is the code I am trying but it Debugs with Type Mismatch and highlights the Custom = Range("B:B").Value line. Any help is much appreciated.I have a cost sheet with a lot of Macros in it.