You should find help in the VV3 guides

or...I can try to help if you begin highlighting here:spoiler: I'm assuming your lift is fixed. Once the lift is fixed, wait for rain. As it begins to rain put an adult villager on the square platform. Villager's bottom bar should read 'standing on the lift'. Wait for the bucket to completely fill. A seed will drop and you can plant it. I haven't needed to make it rain with the weather dance for this, but if you want or need to do the weather dance and lift repair, the detailed answers are in the link above. end highlight

Hope this helps.

Good Luck!