Blitz does not import items, runes or spells automatically.
Please note: In order to be able to use the auto importing feature you must be at-least summoner level 10 or higher, we can't import runes/spells you are below level 10.
If not resolved Step 1:
If the previous steps did not fix your issue, please consider a clean re-installation. A step by step manual for that is available here.