This will now create the new page for you to edit. You must then save it when you have finished.
Dont forget to add a category at the start, then your page will be auto listed for you. e.g [[CATEGORY:ARMY SLANG]] however check that the category exists and that you have spelled it correctly.
The 2nd way is to edit an exisiting page and turn a word into a new link, one that can then be clicked on to bring up an edit screen. Edit the page in question and find the word in the text. now add [[ ]] around the word and check it in preview. that word should now be red, if so you can save and the click on it to edit it.
Now if a page exists but it is also known by a shorter or different name or you would like to abbreviate a link then again edit the page in question find the word/link and this time add the real page name into the link.
eg If I wanted to link R Sigs to the proper Signals page which is The Royal Corps of Signals I would type this,
[[R Sigs|The Royal Corps of Signals]] the link will now work to the right page but display the abbreviated version on the reference page. This stops having 4 or 5 redirected pages with no content.
How did I do the | ?? You get it by pressing shift and the back slash key to the left of your Z key.
No doubt you now have a very big headache, well it will soon pass especially as you find that eureka moment in the wiki.