Press Ctrl-F in your browser. Depending on the browser you use, you will find a search field top right or bottom left.
You have to scroll through you blocks to see your search field highlighted, the browser will not jump to them.
It helps to sort your blocks by category (press your right mouse button at an empty spot and choose: sort blocks by category) or do a cleanup blocks, (same, but choosing Clean up blocks).
If it is a procedure you are looking for, you can press your right mouse button on a call to that procedure and choose highlight.