How can I find a certain node number

Go to tool > find > find entities
Change entity selector to nodes by clicking on the downward arrow > click on the yellow nodes entity selector and choose by id > enter the node number (id) > press enter > check the numbers box (if necessary toggle found nodes to temp nodes so that a yellow temp node will be created on the location of the node this can be cleared from geom > temp nodes) then click on find

Do you have the node number?

if Yes, go to tool page-->Find-->Find entities (Shift+F5 on your keyboard). Switch the selector to nodes, double click on nodes-->by ID and type to node number and click find (check the numbers box ON for your reference). this will highlight the node. refer to top picture.

Now, go to-->Geom page-->Nodes (F8 on your keyboard). click as node and select the node which was highlighted. this will display the node position (X, Y, Z)