I cannot make conference calls on my LG G6 G600L (LG U+) kOREAN ver..

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Android Central Question

I cannot make conference calls on my LG G6 G600L (LG U+) kOREAN ver;

There is a recording button in place of the ADD Call button as in other android mobiles...

Please help on how I can fix this, my work has the need to make conf calls quite frequently.