You choose the thread you want to be stuck. It's per thread option located in Thread Tools.

Any way to make it do it for all threads then?

I think it's not worth to make modifications in order to stick/unstuck all threads. So very quick solution is to run this in "Execute Query" of your Admin CP to stick all threads

UPDATE thread SET stickypost = 1;

and this to unstuck all threads

UPDATE thread SET stickypost = -1;

If you wish default option to be "sticky post" you may modify your database with the following
query in "Execute Query" in case you've already installed this hack:

ALTER TABLE thread MODIFY stickypost INTEGER(10) NOT NULL DEFAULT 1;

and this in case you haven't installed this hack yet:

ALTER TABLE thread ADD stickypost INTEGER(10) NOT NULL DEFAULT 1;

Hope this helps.

hm.. I have a small problem..
I wonder why I get a blank screen after I set it to sticky the frist post? I don't see a redirect mesage..
but I checked and I ddi add the phase..

just be great if stiky threads have it on already... i mean if you sticky thread so first post in it sticky as well ;)

same problem as Skyline_GT.... anyone support that hack???!!! :(