Scheffelera Why do you have the branches held up by twine? Your plant needs to be up potted, potting soil in a new pot at least 6" wider in diameter.
Kevinsky is right, you need some pruning to shorten the length of the branches and get rid of the twine. Shortening the length of the branches takes excess weight off branches unable to hold up the vegetation. Twine only makes weaker branches (think cast on a broken arm).
A bit of balanced fertilizer.
Water the new soil, newly up potted plant, allow to drain, dump any water that collects in the saucer. FEEL the heft of that pot well watered. Only water when you are able to feel a measurable lightness. Use only potting soil, no rocks or gravels below the soil and above the drain hole. Do not water every day. Lift the pot and feel it's weight. Very soon you will know what the heft of that pot and soil and plant are when it needs to be watered.
There aren't 'amounts' of water such as a recipe to be able grow a certain plant. You need to know when your plant NEEDS water, what your plant shows when it needs water. We humans only fail when we try to make plants fit within OUR schedule. An obvious lighter pot signals quite well when to water again. You'll learn YOUR plant's needs.