don't circle your plate with your arms .if you do so,you will become the focus of the tableso,

don't circle your plate with your arms .if you do so,you will become the focus of the tableso,
don't circle your plate with your arms .if you do so,you will become the focus of the table
so,

don't circle your plate with your arms .if you do so,you will become the focus of the tableso,
so 指的是前边那句话 ：circle your plate with your arms.
翻译：不要用你的胳膊去转你的碟,如果你这么做了,你就成了整个桌子的焦点
凑合着看吧,我不知道前后语境,所以直接翻译的

这里的so指代的是circle your plate with your arms。
整句话的意思就是不要用你的胳膊搂着你的盘子（听起来有点夸张，，不知道谁会这么做==#），如果你这样做的话（用胳膊搂着盘子），你就会成为整桌人的焦点。
希望可以帮助你！

不要用你的胳膊转你的盘子，如果你这样做，你将成为整桌的焦点。
so在这里指“circle your plate"，表示像这样做。