Russian Flower Piping Tips on a Buttercream Cake - How to decorate a stroller cake

I’m using the Wilton Stroller cake pan in this video Tutorials featured in the video: Smurfette cake: Olaf Cake Dog cake: Supplies used in this video: Cake pan: =as_li_qf_sp_asin_il_tl?ie=UTF8&tag=montreconfec-20&camp=1789&creative=9325&linkCode=as2&creativeASIN=B017IYPPW8&linkId=059260111f89f658f2cd03415fc12277 Flower tips (Russian tips): Ruff