To save an easily accessable bookmark to your currently working kata you can add a star (top-left star link under the kata's name) or add it to a custom collection.

Either way the kata's you have ever worked on (attempted to provide a solution) and are incomplete are saved in your profile page under the Kata section in the Unfinished tab.

Notice that if you want the partial solution to be saved along with the reference to the kata, you must hit the Attempt button at least one time. If you run only the local test cases the partial solution will not be saved. At least this is how it worked so far and this may be subject to change.

i have the same problem